Fixing binder and tutorials

Author: JanBobolz

Dockerfile

@@ -1,7 +1,7 @@
 FROM openjdk:11.0.12-jdk-buster
 
 RUN apt-get update
-RUN apt-get install -y python3-pip
+RUN apt-get install -y python3-pip libffi-dev
 
 RUN pip3 install --no-cache-dir jupyter jupyterlab
 

getting-started/5-minute-tutorial.ipynb

@@ -39,7 +39,7 @@
     "import org.cryptimeleon.math.structures.groups.lazy.LazyGroup;\n",
     "import org.cryptimeleon.math.structures.groups.*;\n",
     "\n",
-    "Group group = new LazyGroup(new Secp256k1()); //LazyGroup evaluates group operations lazily (see later)"
+    "Group group = new Secp256k1(); //this is a LazyGroup which evaluates group operations lazily (see later)"
    ]
   },
   {
@@ -365,7 +365,7 @@
    "mimetype": "text/x-java-source",
    "name": "Java",
    "pygments_lexer": "java",
-   "version": "14.0.1+7"
+   "version": "11.0.12+7"
   }
  },
  "nbformat": 4,

getting-started/protocols-tutorial.ipynb

@@ -41,8 +41,8 @@
    "metadata": {},
    "outputs": [],
    "source": [
-    "%maven org.cryptimeleon:math:3.0.1\n",
-    "%maven org.cryptimeleon:craco:3.0.0\n",
+    "%maven org.cryptimeleon:math:2.+\n",
+    "%maven org.cryptimeleon:craco:2.+\n",
     "\n",
     "import org.cryptimeleon.math.structures.groups.elliptic.nopairing.Secp256k1;\n",
     "import org.cryptimeleon.math.structures.groups.lazy.*;\n",